What does code P25AB mean?

Q: What does code P25AB mean?

Piston Cooling Oil Control Circuit High. P25AB indicates that the engine control module (ECM) has detected an abnormally high voltage on the piston cooling oil control circuit, which typically points to an open circuit, a short to voltage, or a failed control solenoid. The ECM commands a duty cycle to regulate oil flow for piston cooling, and when the feedback voltage exceeds the expected range, it stores this code and may disable the piston cooling function.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25AB

P25ABPiston Cooling Oil Control Circuit High

P25AB indicates that the engine control module (ECM) has detected an abnormally high voltage on the piston cooling oil control circuit, which typically points to an open circuit, a short to voltage, or a failed control solenoid. The ECM commands a duty cycle to regulate oil flow for piston cooling, and when the feedback voltage exceeds the expected range, it stores this code and may disable the piston cooling function.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.